Sweet sauce, almost cold, with some hot bananas (9,6)
I believe the answer is:
chocolate mousse
'sweet' is the definition.
(chocolate mousse is a kind of sweet)
'sauce almost cold with some hot bananas' is the wordplay.
'almost' means to remove the last letter (almost the whole word is kept).
'with' is a charade indicator (letters next to each other).
'bananas' indicates an anagram (bananas can informally mean crazy).
'cold' with its final letter removed is 'col'.
'sauce'+'col'+'some'+'hot'='saucecolsomehot'
'saucecolsomehot' with letters rearranged gives 'CHOCOLATE MOUSSE'.
(Another definition for chocolate mousse that I've seen is " oily sea foam".)